Enforce CI pipelines running with expected go version

[#132166973](https://www.pivotaltracker.com/story/show/132166973)

bin/require-ci-golang-version

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+source ci/docker/deps-golang
+
+if ! go version | grep -q " go$GO_VERSION " ; then
+  echo -n "DEBUG: " ; go version
+  echo "ERROR: expected version to be $GO_VERSION" >&2
+  exit 1
+fi

ci/docker/Dockerfile

@@ -33,9 +33,9 @@ RUN cd /tmp && ./install-ruby.sh && rm install-ruby.sh
 #global
 ENV GOROOT /usr/local/go
 ENV PATH $GOROOT/bin:$PATH
-ADD install-go.sh /tmp/install-go.sh
+ADD install-go.sh deps-golang /tmp/
 RUN chmod a+x /tmp/install-go.sh
-RUN cd /tmp && ./install-go.sh && rm install-go.sh
+RUN cd /tmp && ./install-go.sh && rm install-go.sh deps-golang
 
 ADD root_bashrc /root/.bashrc
 

ci/docker/deps-golang

@@ -0,0 +1,3 @@
+GO_VERSION=1.7.1
+GO_ARCHIVE_SHA256=43ad621c9b014cde8db17393dc108378d37bc853aa351a6c74bf6432c1bbd182
+GO_ARCHIVE_URL=https://storage.googleapis.com/golang/go$GO_VERSION.linux-amd64.tar.gz

ci/docker/install-go.sh

@@ -2,9 +2,8 @@
 
 set -eux
 
-GOROOT=/usr/local/go
-GO_ARCHIVE_URL=https://storage.googleapis.com/golang/go1.7.1.linux-amd64.tar.gz
-GO_ARCHIVE_SHA256=43ad621c9b014cde8db17393dc108378d37bc853aa351a6c74bf6432c1bbd182
+source deps-golang
+
 GO_ARCHIVE=$(basename $GO_ARCHIVE_URL)
 
 echo "Downloading go..."

ci/tasks/build.sh

@@ -13,6 +13,8 @@ filename="bosh-init-${semver}-${GOOS}-${GOARCH}"
 
 cd gopath/src/github.com/cloudfoundry/bosh-init
 
+bin/require-ci-golang-version
+
 git_rev=`git rev-parse --short HEAD`
 version="${semver}-${git_rev}-${timestamp}"
 

ci/tasks/test-acceptance.sh

@@ -40,4 +40,5 @@ set -x
 export BOSH_LITE_PRIVATE_KEY=$tmpfile
 
 cd $GOPATH/src/github.com/cloudfoundry/bosh-init
+./bin/require-ci-golang-version
 base=$PWD ./bin/test-acceptance-with-vm --provider=aws

ci/tasks/test-integration.sh

@@ -9,6 +9,7 @@ export PATH=/usr/local/ruby/bin:/usr/local/go/bin:$PATH
 export GOPATH=$(pwd)/gopath
 
 cd gopath/src/github.com/cloudfoundry/bosh-init
+bin/require-ci-golang-version
 bin/clean
 bin/install-ginkgo
 bin/test-integration

ci/tasks/test-unit.sh

@@ -8,6 +8,7 @@ export GOPATH=$(pwd)/gopath
 source /root/.bashrc
 
 cd gopath/src/github.com/cloudfoundry/bosh-init
+bin/require-ci-golang-version
 bin/clean
 bin/install-ginkgo
 bin/test-prepare

ci/test.sh

@@ -2,4 +2,5 @@
 set -ex
 bin=$(cd $(dirname $0)/../bin && pwd)
 
+$bin/require-ci-golang-version
 exec $bin/test